Abnormality determination system for secondary battery

Abstract

An abnormality determination system may include a secondary battery that includes a battery case including a positive terminal and a negative terminal, a switch unit that connects electrically the positive terminal to the battery case based on a first control signal, the switch unit breaking electrically a connection between the positive terminal and the battery case based on a second control signal, a voltage measurement unit that measures a voltage of the battery case, and a determination unit that determines an abnormality of the secondary battery based on the voltage.

1 . An abnormality determination system comprising:
 a secondary battery that includes a battery case including a positive terminal and a negative terminal;   a switch unit that connects electrically the positive terminal to the battery case based on a first control signal, the switch unit breaking electrically a connection between the positive terminal and the battery case based on a second control signal;   a voltage measurement unit that measures a voltage of the battery case; and   a determination unit that performs a determination of an abnormality in the secondary battery based on the voltage that is measured by the voltage measurement unit, and   wherein if voltage drop per unit of time of the voltage, which is measured by the voltage measurement unit, is greater than or equal to a prescribed threshold value after the second control signal is output to the switch unit at a prescribed timing, then the determination unit determines that the secondary battery is abnormal and the determination unit outputs the first control signal to the switch unit after the determination by the determination unit.   
     
     
         2 . The abnormality determination system according to  claim 1 , further comprising:
 a display unit that displays that the secondary battery is abnormal when receiving an abnormal signal, and   wherein when the determination unit determines that the secondary battery is abnormal, the determination unit outputs the abnormal signal to the display unit.   
     
     
         3 . The abnormality determination system according to  claim 2 , further comprising:
 a trigger apparatus that outputs a trigger signal, and   wherein when the determination unit receives the trigger signal, the determination unit outputs the second control signal to the switch unit without relation to the prescribed timing, and then when drop of the voltage, which is measured by the voltage measurement unit, per unit of time is greater than or equal to the prescribed threshold value, the determination unit determines that the secondary battery is abnormal and then the determination unit outputs the first control signal to the switch unit.   
     
     
         4 . The abnormality determination system according to  claim 3 , wherein the abnormality determination system is a moving vehicle that includes an electric power load that is driven by receiving an electric power from the secondary battery.